[PATCH] drm/i915/gt: fix itnull.cocci warnings

[kernel test robot]

From: kernel test robot <lkp at intel.com>

drivers/gpu/drm/i915/gt/gen6_ppgtt.c:263:6-8: ERROR: iterator variable bound on line 262 cannot be NULL
drivers/gpu/drm/i915/gt/gen6_ppgtt.c:322:7-9: ERROR: iterator variable bound on line 321 cannot be NULL

 Many iterators have the property that the first argument is always bound
 to a real list element, never NULL.

Semantic patch information:
 False positives arise for some iterators that do not have this property,
 or in cases when the loop cursor is reassigned.  The latter should only
 happen when the matched code is on the way to a loop exit (break, goto,
 or return).

Generated by: scripts/coccinelle/iterators/itnull.cocci

Fixes: 1d567ec61933 ("drm/i915/gt: Switch to object allocations for page directories")
Signed-off-by: kernel test robot <lkp at intel.com>
---

tree:   git://anongit.freedesktop.org/drm-intel drm-intel-next-queued
head:   06b108297b5cc24418e91c1103587ac7ca6fd03f
commit: 1d567ec619333e54283dcd02780ab9a71ef86e44 [27/28] drm/i915/gt: Switch to object allocations for page directories

Please take the patch only if it's a positive warning. Thanks!

 gen6_ppgtt.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
@@ -260,8 +260,9 @@ static void gen6_ppgtt_free_pd(struct ge
 	u32 pde;
 
 	gen6_for_all_pdes(pt, pd, pde)
-		if (pt)
-			free_px(&ppgtt->base.vm, pt);
+	{
+		free_px(&ppgtt->base.vm, pt);
+	}
 }
 
 static void gen6_ppgtt_cleanup(struct i915_address_space *vm)
@@ -319,7 +320,7 @@ static void pd_vma_unbind(struct i915_ad
 
 	/* Free all no longer used page tables */
 	gen6_for_all_pdes(pt, ppgtt->base.pd, pde) {
-		if (!pt || atomic_read(&pt->used))
+		if (atomic_read(&pt->used))
 			continue;
 
 		free_px(&ppgtt->base.vm, pt);